The KMC Controls MEP-3503 Actuator is a precision-engineered 24VAC zone actuator designed for high-reliability on/off control in HVAC systems

featuring an updated white housing and integrated occupancy sensor for proactive energy management

The valve's robust construction supports high-pressure environments typical of modern R-410A systems

Thermal Resilience: Specialized EPDM elastomers are rated for hot water service up to 150°F

though an externally equalized valve can often replace an internal one if the line is added

ClimateMaster 33B0043N07 TXV 321894-706 The KMC Controls MEP-3503 ActuatorThe ClimateMaster 33B0043N07 TXV is a critical OEM metering device engineered for 2 ton high performance geothermal and water source heat pump systems. This thermostatic expansion valve features 3 8" x 3 8" ODF sweat connections and a 30 inch capillary tube, facilitating precise refrigerant flow control into the evaporator. Designed to maintain optimal superheat, this valve protects the compressor from liquid slugging while maximizing system energy